ERROR: req.logIn is not a function Passport Js MERN STACK - node.js

Question

I am trying use passport-local to authenticate user for a MERN Stack project. Currently I am unable to LOG IN or LOG OUT and I keep getting errors like this:
TypeError: req.logIn is not a function & req.logOut is not a function
I am not sure why is this happening. I have been following the Passport Js documentation. What should I do to fix this?
Thank you
const express = require("express");
const app = express();
const cors = require("cors");
const mongoose = require("mongoose");
const passport = require("passport");
const passportLocal = require("passport-local").Strategy;
const initialize = require("./passport-config");
const session = require("express-session");
const bcrypt = require("bcrypt");
const User = require("./modules/User");
const port = XXXXX;
mongoose.connect(
"XXXXXXXXXX",
{ useNewUrlParser: true },
() => console.log("Mongoose Connected"),
);
app.use(express.urlencoded({ extended: true }));
app.use(express.json());
app.use(cors());
app.use(
session({
secret: "secret",
resave: false,
saveUninitialized: false,
}),
);
passport.use(passport.initialize());
passport.use(passport.session());
initialize(passport);
app.get("/users", (req, res) => {
res.send("Hello");
});
app.post("/users/create", (req, res) => {
User.findOne(
{ username: req.body.username },
async (err, doc) => {
if (err) throw err;
if (doc) {
res.json({
auth: false,
message: "User Already Exist",
});
} else {
const hashedPassword = await bcrypt.hash(
req.body.password,
10,
);
const newUser = User({
username: req.body.username,
password: hashedPassword,
});
await newUser.save();
res.json({
auth: true,
message: "User Created",
});
console.log("User Created");
}
},
);
});
app.get("/users/logout", (req, res) => {
req.logOut();
res.send(true);
console.log("Logged Out");
});
app.post("/users/login", (req, res, next) => {
passport.authenticate("local", (err, user, info) => {
if (err) {
return next(err);
}
if (!user) {
res.json({
auth: true,
message: "Cannot Log In",
});
}
req.logIn(user, (err) => {
if (err) {
return next(err);
}
res.json({
auth: true,
message: "User Logged In",
});
console.log("Successfully Logged In");
});
})(res, req, next);
});
app.listen(port, () =>
console.log(`Server started on port: ${port}`),
);

Answer 1

The problem is here
passport.use(passport.initialize());
passport.use(passport.session());
initialize(passport);
it is not passport.use it should be app.use and
the initialize passport should be called first.
initialize(passport);
app.use(passport.initialize());
app.use(passport.session());